Hydraulic control device for automatic transmission and method for manufacturing the same

Abstract

A hydraulic control device for an automatic transmission, the hydraulic control device including: a first layer having a first parting surface and a plurality of first grooves formed in the first parting surface; and a second layer that has a second parting surface and a plurality of second grooves formed in the second parting surface and facing the plurality of first grooves, and that is stacked on the first layer in a stacking direction with the second parting surface facing the first parting surface of the first layer, so that the plurality of first grooves and the plurality of second grooves form a plurality of first oil passages.

1 - 14 . (canceled) 
     
     
         15 . A hydraulic control device for an automatic transmission, the hydraulic control device comprising:
 a first layer having a first parting surface and a plurality of first grooves formed in the first parting surface; and   a second layer that has a second parting surface and a plurality of second grooves formed in the second parting surface and facing the plurality of first grooves, and that is stacked on the first layer in a stacking direction with the second parting surface facing the first parting surface of the first layer, so that the plurality of first grooves and the plurality of second grooves form a plurality of first oil passages, wherein
 a first protrusion is formed either between adjacent grooves of the plurality of first grooves on the first parting surface of the first layer so as to protrude toward the second layer or between adjacent grooves of the plurality of second grooves on the second parting surface of the second layer so as to protrude toward the first layer, 
 a first recess in which the first protrusion is fitted is either formed in the second parting surface of the second layer if the first protrusion is formed between the adjacent grooves of the plurality of first grooves, or formed in the first parting surface of the first layer if the first protrusion is formed between the adjacent grooves of the plurality of second grooves, and 
 the first layer and the second layer are stacked such that the first protrusion is fitted in the first recess between adjacent ones of the first oil passages, and are joined via the first protrusion and the first recess. 
   
     
     
         16 . The hydraulic control device for the automatic transmission according to  claim 15 , wherein
 the first protrusion is formed on the first layer and the first recess is formed in the second layer, and   a bottom of the first recess is located at a greater depth from the second parting surface than a bottom of the second groove.   
     
     
         17 . The hydraulic control device for the automatic transmission according to  claim 16 , wherein
 the first protrusion has, in a distal end of the first protrusion, a protrusion-side groove that is a groove with a semicircular section having a chord on a first recess side,   the first recess has, in a bottom of the first recess, a recess-side groove that is a groove with a semicircular section having a chord on a first protrusion side, and   the first protrusion is fitted in the first recess such that the protrusion-side groove and the recess-side groove form a clearance with a circular section.   
     
     
         18 . The hydraulic control device for the automatic transmission according to  claim 17 , wherein
 the first protrusion is formed on the first layer, the first recess is formed in the second layer, and the second grooves have a semicircular section.   
     
     
         19 . The hydraulic control device for the automatic transmission according to  claim 18 , wherein
 clearance is provided between the first protrusion and the first recess, and a sealing member is injected into the clearance to join the first protrusion and the first recess.   
     
     
         20 . The hydraulic control device for the automatic transmission according to  claim 19 , wherein
 the sealing member is an injection molding material, and the injection molding material is injected into the clearance serving as a cavity to join the first protrusion and the first recess by injection molding.   
     
     
         21 . The hydraulic control device for the automatic transmission according to  claim 20 , wherein
 each of the first layer and the second layer is formed by primary injection molding, and the first layer and the second layer are joined by secondary injection molding using the clearance as a cavity.   
     
     
         22 . The hydraulic control device for the automatic transmission according to  claim 21 , further comprising:
 a third layer having a third parting surface and a plurality of third grooves formed in the third parting surface, wherein:
 the second layer further has a fourth parting surface located on an opposite side of the second layer from the second parting surface, and a plurality of fourth grooves formed in the fourth parting surface and facing the plurality of third grooves, and is stacked on the third layer with the fourth parting surface facing the third parting surface of the third layer, so that the plurality of third grooves and the plurality of fourth grooves form a plurality of second oil passages, 
 a second protrusion is formed either between adjacent grooves of the plurality of fourth grooves on the fourth parting surface of the second layer so as to protrude toward the third layer or between adjacent grooves of the plurality of third grooves on the third parting surface of the third layer so as to protrude toward the second layer, 
 a second recess in which the second protrusion is fitted is either formed in the third parting surface of the third layer if the second protrusion is formed between the adjacent grooves of the plurality of fourth grooves, or formed in the fourth parting surface of the second layer if the second protrusion is formed between the adjacent grooves of the plurality of third grooves, and 
 the second layer and the third layer are stacked such that the second protrusion is fitted in the second recess between adjacent ones of the second oil passages, and are joined via the second protrusion and the second recess. 
   
     
     
         23 . The hydraulic control device for the automatic transmission according to  claim 22 , wherein
 the second protrusion is formed on the third layer, the second recess is formed in the second layer, and the fourth grooves have a semicircular section.   
     
     
         24 . The hydraulic control device for the automatic transmission according to  claim 23 , wherein
 the first protrusion is formed on the first layer, the first recess is formed in the second layer, the second grooves have a semicircular section, the second protrusion is formed on the third layer, the second recess is formed in the second layer, and the fourth grooves have a semicircular section, and   the second grooves and the fourth grooves are arranged in a direction perpendicular to the stacking direction such that the fourth groove is located between the second grooves.   
     
     
         25 . The hydraulic control device for the automatic transmission according to  claim 16 , wherein
 a distal end of the first protrusion has a rectangular section,   a bottom of the first recess has a rectangular section, and   the first protrusion is fitted in the first recess so that clearance with a rectangular section is formed therebetween.   
     
     
         26 . The hydraulic control device for the automatic transmission according to  claim 25 , wherein
 the first protrusion is formed on the first layer, the first recess is formed in the second layer, and the second grooves have a semicircular section.   
     
     
         27 . The hydraulic control device for the automatic transmission according to  claim 16 , wherein
 the first protrusion and the first recess are joined by adhesion.   
     
     
         28 . The hydraulic control device for the automatic transmission according to  claim 27 , further comprising:
 a third layer having a third parting surface and a plurality of third grooves formed in the third parting surface, wherein:
 the second layer further has a fourth parting surface located on an opposite side of the second layer from the second parting surface, and a plurality of fourth grooves formed in the fourth parting surface and facing the plurality of third grooves, and is stacked on the third layer with the fourth parting surface facing the third parting surface of the third layer, so that the plurality of third grooves and the plurality of fourth grooves form a plurality of second oil passages, 
 a second protrusion is formed either between adjacent grooves of the plurality of fourth grooves on the fourth parting surface of the second layer so as to protrude toward the third layer or between adjacent grooves of the plurality of third grooves on the third parting surface of the third layer so as to protrude toward the second layer, 
 a second recess in which the second protrusion is fitted is either formed in the third parting surface of the third layer if the second protrusion is formed between the adjacent grooves of the plurality of fourth grooves, or formed in the fourth parting surface of the second layer if the second protrusion is formed between the adjacent grooves of the plurality of third grooves, and 
 the second layer and the third layer are stacked such that the second protrusion is fitted in the second recess between adjacent ones of the second oil passages, and are joined via the second protrusion and the second recess. 
   
     
     
         29 . The hydraulic control device for the automatic transmission according to  claim 16 , wherein
 the first protrusion has, in a distal end of the first protrusion, a protrusion-side groove that is a groove having a half polygonal section with only an obtuse angle and opening toward the first recess,   the first recess has, in a bottom of the first recess, a recess-side groove that is a groove having a half polygonal section with only an obtuse angle and opening toward the first protrusion, and   the first protrusion is fitted in the first recess, whereby the protrusion-side groove and the recess-side groove form clearance having a polygonal section with only an obtuse angle.   
     
     
         30 . The hydraulic control device for the automatic transmission according to  claim 15 , wherein
 the first protrusion has, in a distal end of the first protrusion, a protrusion-side groove that is a groove with a semicircular section having a chord on a first recess side,   the first recess has, in a bottom of the first recess, a recess-side groove that is a groove with a semicircular section having a chord on a first protrusion side, and   the first protrusion is fitted in the first recess, whereby the protrusion-side groove and the recess-side groove form clearance with a circular section.   
     
     
         31 . The hydraulic control device for the automatic transmission according to  claim 15 , wherein
 a distal end of the first protrusion has a rectangular section,   a bottom of the first recess has a rectangular section, and   the first protrusion is fitted in the first recess so that clearance with a rectangular section is formed therebetween.   
     
     
         32 . The hydraulic control device for the automatic transmission according to  claim 15 , wherein
 the first protrusion is formed on the first layer, the first recess is formed in the second layer, and the second grooves have a semicircular section.   
     
     
         33 . The hydraulic control device for the automatic transmission according to  claim 15 , wherein
 clearance is provided between the first protrusion and the first recess, and a sealing member is injected into the clearance to join the first protrusion and the first recess.   
     
     
         34 . A method for manufacturing a hydraulic control device for an automatic transmission, the method comprising:
 injection-molding each of a first layer that has a first parting surface, a plurality of first grooves formed in the first parting surface, and a protrusion or a recess formed between adjacent ones of the first grooves in the first parting surface and a second layer that has a second parting surface, a plurality of second grooves formed in the second parting surface and facing the plurality of first grooves, and a recess or a protrusion formed in the second parting surface so as to be fitted with the protrusion or the recess of the first layer with clearance in a stacking direction; and   stacking the first layer and the second layer such that the protrusion is fitted in the recess, and joining the first layer and the second layer by secondary injection molding using the clearance as a cavity.